Octane grade?
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 2,295
Likes: 14
From: Grand Sport #82
Octane grade?
MY LT4 with hotcam and a PCM4LESS tune, get some hicks or dead spots on its way to the red line usually in the 5000-5500 rpms area. Sometimes it pulls hard all the way, and sometimes I gets these hicks on the way there.
I remember that when I had Bryan to do the PCM, I marked the box with "Premium". Then i just got the news that the octane ratings in Europe and US are different. When I fill up with 95 here in Denmark, it corsponds to 90 in the US.
Now would that have any real big impact on the performance of a Lt4 with mods?
(I know, I can just go fill it with higher octane gas, but I have to wait about 3 weeks to be able to do so...)
I remember that when I had Bryan to do the PCM, I marked the box with "Premium". Then i just got the news that the octane ratings in Europe and US are different. When I fill up with 95 here in Denmark, it corsponds to 90 in the US.
Now would that have any real big impact on the performance of a Lt4 with mods?
(I know, I can just go fill it with higher octane gas, but I have to wait about 3 weeks to be able to do so...)
Last edited by Lars87; Aug 8, 2009 at 05:35 PM.
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 2,295
Likes: 14
From: Grand Sport #82
I had a problem with misses/rough running and low rpms in high gear. That turned out to be a crossed injecton wire, so that all done...
Ok, then where do you suggest I start looking?
Wires are new
Opti is new (delphi)
Coil is new (standard)
Plugs are new (NGK)
